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While installing a file, the pop up with the fake flash player downloaded a dmg to my computer. Because I was already downloading something else and expecting to find it in my downloads I accidentally opened the dmg file. At this point I knew this was not the software I wished to download so I closed the window. The installer might have been left open for several hours past that until I ejected it and deleted it however. So I opened the dmg file and left it open for a while but I didn’t install anything nor run it. Am I good? Is there anyway to be sure?

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If you just opened the .dmg image and didn't manually open any file or run any program located inside it, you're fine: as far as I know, there's no "autorun" functionality on DMG images in macOS.

  • I might note that theoretically, opening any file on your computer could install malicious code. But that would require an extremely major zero day exploit, so unless you're a major politician being targeted by someone with enormous amounts of capital, you're fine. – Wowfunhappy Oct 3 '18 at 16:14

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